I never did get this to work but I did successfully manage Jurgen's multimode filter mod..
http://www.jhaible.de/hjob8mod.html
.. and it rocks! I would highly recommend this to any OB-8 owners.
The high pass filter really opens up a new sonic spectrum for this instrument._________________DRONEGOAT

Here are a few tips..
-You don't have to cut the traces to the cx21 capacitors. Just cut or desolder the leg leaving enough of the lead so that you can solder a connection to it later.
-It is much easier to make the connection to pin 14 of ux07 before you mount the chip and solder pins 8 and 16.
Good luck._________________DRONEGOAT

i've noticed that you dont have to solder a wire to pin 14. you can also solder it info hole after desoldered cap. anyway i'm in a half way. one of 4052's got damaged and i have to buy new one. then i'll be able to finish it

anyway. do you know how to calibrate arpeggiator? mine acts weird. when i press a note - C for example, ob8 arpeggiates it and later changes transposition etc

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